Inorganic Waste Treatment (WS4)

Inorganic waste treatment is an important aspect of sustainable campus management under the UI GreenMetric framework. Then, universities are encouraged to implement effective inorganic waste management practices, including waste segregation, recycling, and reuse, to minimize environmental impacts, reduce landfill disposal, and promote resource efficiency and circular economy principles within the campus community.

The university implements inorganic waste treatment through a source-segregation system using clearly labeled waste bins placed throughout campus facilities. Accordingly, the waste materials are separated into different categories, including general waste, wet waste, and recyclable waste, to facilitate appropriate collection, recycling, and disposal processes. Then, recyclable materials, such as plastic, paper, metal, and glass, are collected separately and transferred to recycling facilities for further processing and resource recovery. Obviously, this waste segregation practice enhances recycling efficiency, reduces the volume of waste sent to landfills, minimizes environmental impacts, and promotes sustainable waste management in accordance with the UI GreenMetric framework and circular economy principles.

Waste Type	Proportion (%)	Volume (m3/day)	Average Density (kg/m3)	Weight (kg/day)
Plastic	50%	4.00	65	260
Paper	15%	1.20	100	120
Glass	5%	0.40	400	160
Others	30%	2.40	180	432
Total	100%	8.00	–	972 kg/day

1. Municipal Partnership for Non-Recyclable Inorganic Waste Treatment

The bottom section of the memo outlines the formal partnership between the university and the local municipality for daily waste treatment:

• The Treatment Partner: The university relies on Sakon Nakhon City Municipality to manage, collect, and systematically dispose of its non-recyclable general waste.
• Volume and Capacity Management: The data shows the university manages a consistent volume of general waste averaging 8 cubic meters per day ($\text{m}^3/\text{day}$).
• Regulatory Compliance & Budgeting: The university systematically budgets and pays municipal disposal fees based on exact volumetric rates (e.g., handling baseline volumes under a specific fee tier and paying a standardized monthly collection and disposal fee, which amounted to 13,200 Baht for the highlighted month). This demonstrates that the university’s daily inorganic trash output is legally integrated into a safe municipal waste-to-disposal stream.

2. Material Recovery and Value-Added Recycling (Scrap & E-Waste)

The top section of the memo details how the university separates high-value, durable inorganic materials from the general waste stream instead of sending them to landfills. This represents a solid Material Recovery and Circular Economy practice:

• Asset Salvaging and Sorting: When buildings are renovated or dismantled, items are sorted into specific inorganic material categories rather than being thrown away.
• Separation of Recyclable Materials: The document lists precise categories of recovered inorganic commodities sold to certified local recycling vendors, including:
  • Scrap Metals: Scrap iron (3,756 kg), scrap aluminum (329 kg), and scrap zinc (2,364 kg).
  • Durable Fixtures: Toilets, sinks, urinals, doors, and windows.
• Environmental & Economic Benefit: By converting over 6.4 tons of scrap metal and fixtures back into the industrial manufacturing cycle, the university actively reduces raw resource extraction, diverts massive bulk waste from landfills, and generates revenue (71,610 Baht in this instance) to reinvest into campus sustainability initiatives.

Types of Waste Sold in B.E. 2568 (2025)

Item	Quantity	Value (Baht)
Heavy scrap iron	3,756 kg	30,799.20
Aluminium scrap	329 kg	19,740.00
Brass scrap	2,364 kg	11,820.00
Steel drums	63 drums	6,300.00
Fabric boxes / crates	15 crates	750.00
Wooden tables (as-is condition)	24 units	1,200.00
Doors and door frames	10 sets	1,000.00

Executive Summary

Sakon Nakhon Rajabhat University has proceeded with the sale of damaged and deteriorated materials through a specific selection method, following a public auction that received no bidders. The university was able to sell 7 categories of materials, namely scrap iron, aluminium, brass, steel drums, fabric boxes, wooden tables, and doors/door frames. The total revenue generated from the sale amounted to 71,610 Baht, and the buyers have successfully completed the payment to the university.